Structural instability of atmospheric flows under perturbations of the mass balance and effect in transport calculations

7th International Congress of Engineering Physics

物理学;工业技术

Núñez, M.A.^1 ; Mendoza, R.^1

Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, A. P. 55-534, C. P. 09340, Mexico^1

关键词: Conservation of mass;    Continuity equations;    Different structure;    Emergency response systems;    Structural instability;    Transport calculation;    Transport equation;    Transport-diffusion equations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/582/1/012015/pdf
DOI  :  10.1088/1742-6596/582/1/012015

学科分类：工业工程学

来源: IOP

【 摘 要 】

Several methods to estimate the velocity field of atmospheric flows, have been proposed to the date for applications such as emergency response systems, transport calculations and for budget studies of all kinds. These applications require a wind field that satisfies the conservation of mass but, in general, estimated wind fields do not satisfy exactly the continuity equation. An approach to reduce the effect of using a divergent wind field as input in the transport-diffusion equations, was proposed in the literature. In this work, a linear local analysis of a wind field, is used to show analytically that the perturbation of a large-scale nondivergent flow can yield a divergent flow with a substantially different structure. The effects of these structural changes in transport calculations are illustrated by means of analytic solutions of the transport equation.